Polyazo compounds and material colored therewith



Patented Oct. 1, 1940 UNITED STATES PATENT OFFICE POLYAZO COMPOUNDS AND MATERIAL COLORED THEREWITH James G. McNally and Joseph B. Dickey, Rochester, N. Y., assignors to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey No Drawing. Application May 25, 1939, Serial No. 275,720

9 Claims.

1o CHaX and O HzX wherein R and R1 each represent a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, and a heterocyclic nucleus, R2 represents a. member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, an azobenzene nucleus, and a heterocyclic nucleus, R3 represents a benzene nucleus, and a naphthalene nucleus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, R4 and R5 each represent a member selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group, and a heterocyclic group, and X represents a member selected from the group consisting of a hydroxyl group, an organic ether group, an organic ester group, and a sulphonic acid group wherein the hydrogen may be substituted either by an ammonium radical or by an alkali forming metal.

It is an object, therefore, of this invention to prepare the dyes of the class above described and to color cellulose organic derivatives, wool and silk in the form of threads, yarns, filaments, and fabric materials therewith. In general the polyazo compounds of our invention produce on textile materials colors which show good fastness to light, to washing, and to the action of salt water. As diazotization components there may be used various aromatic p-amino monoand polyazo compounds including p-amino azobenzene and 60 p-amino disazobenzene and their substitution products, and particularly the p-amino azo compounds having the general formula:

wherein R, Y, and K have the meanings previously defined, which are prepared by coupling the diazo salts of various suitable aromatic amines with para substituted meta-aminobenzyl alcohols and their etherified, esterified, and sulfonated derivatives following in general the procedures of our copending applications Serial No. 147,541, and

Serial No. 268,126, of which this invention is a further development.

The following examples illustrate the method of preparation of the polyazo compounds of our invention:

' Emample 1 22.7 grams of 4-amino-2-hydroxymethyl azobenzene are stirred into 450 c. c. of water, 35 c. c. of hydrochloric acid added, and the mixture cooled to 10 0. followed thereafter by the addition of 36 grams of a 20% solution of sodium nitrite. When diazotization is complete the mixture is added dropwise with stirring to an iced solution of 14.4 grams of methone in sodium carbonate. When coupling is complete, the mixture is filtered, washed and dried. Cellulose acetate is colored orange-yellow shades from aqueous suspensions of the dye.

The disazo compound thus obtained has the formula:

The same process as described above may be used for diazotizing and coupling 2-nitro-2'-hydroxymethyl-4'-amino-5'-methoxy azobenzene with barbituric acid to form the disazo compound:

which colors cellulose acetate orange-yellow shades from aqueous suspensions of the dye; and 4-nitro-2-methoxymethyl-4- amino 5'- methyl azobenzene with 1-phenyl-3-methyl-5-pyramlone to form the disam compound:

CIHI

which colors cellulose acetate orange-yellow shades from aqueous suspensions of the dye.

Example 2 ture. When the coupling reaction is complete the mixture is made acid-to Congo red indicatot with mineral acid, and the dye filtered on; washedand dried. Celluloseacetate is. etioree orange;

33.7 gains pf fi cnloroe? hydroxymethyl-4 amino'.-5-phenyl azobenzene are diazotized foladded, and the diazosolution stirred into the mixture. "After standing fona short time, the reaction mixture is slowly made neutral to Congo red indicator-with sodium acetate. When coupling is complete, the dye is filtered'off, washed and dried. Cellulose acetate is colored yellowishorange shades from aqueous suspensions of the dye. The disazo compound thus prepared has the formula;

I 7 e s OCH; OCH: H NOrQN=N--N=N- N oimon c1 cnroolmon cmoooon;

which colors cellulose acetate brownish-rubine shades from aqueous suspensions of the dye; 2, 4 dinitro 6 bromo 2'- hydroxy-methyl-4'- amino-'-p-hydroxyethoxy azobenzene with 3- ethyl glycerylamino-benzyl alcohol to produce the disazo compound: j

B11 oczH oH /C2H5 7 N02 CHzOH omoH CmCHOHCHZOH which colors cellulose acetate brownish-rubine shades from aqueous suspensions of the dye; 5-naphthol-azo-p-amino-o-benzyl alcohol with m-ethyl sodium sulfoethylamino benzyl alcohol to produce the disazo compound:

HO v

N=N N onion omen GZHiSOiN" which colors cellulose acetate reddish-blue shades 10.8 grams of p-cresol from aqueous suspensions of the dye; and 4-nitro- 4'-amino-5'-cyclohexyl-2-hydroxymethyl azobenzene with 3-butyl sodium sulfatoethylamino- 4-methoxy benzyl alcohol to produce the (115320 compound:

colors cellulose acetate brownish-rubine Shades from aqueous solutions or suspensions of r v the dye which may contain salt. "a yellow shadesfrom aqueous suspeiisiohs of the;

ZdYe. f The disazo compound thus obtaihedzhas the ciom ulaz.

Example 4 I One mole of methoxybenzothiazole-azo-2- hydroxymethyl-4-aminobenzene is diazotized and coupled with one mole of p-sulfo-ethyl-mtoluidine. following the procedure described in Example 3. The disazo compound thus obtained colors cellulose acetate brownish-red shades from aqueous suspensions of the dye, and has the form ula:

. s H o H.011 N. N onion CH:

" Example 5 0.1 mole of 2-chloro-.2-sodium sulfomethyl- 4'-amino azobenzene is dissolved in cold dilute hydrochloric acid; ice added, and mixture diazotized by the addition of 6.9 grams of sodium nitrite. .This solution is then added to 0.1 mole of diethylan'iline dissolved in cold dilute hydrochloric acid, and the coupling reaction completed by adding sodium acetate. The dye is salted out, filtered and dried. Cellulose acetate is colored orange-red shades from anaqueous solution of the dye which may contain salt. The disazo compound thus obtained has the formula:

CaHs

o1 CHzSOaNa Example 6 0.1 mole of 4-nitro-2'-amino sulfomethyl-4'- amino azobenzene is diazotized and coupled with 0.1 mole of butyl-m-toluidine following the procedure described in Example 5. Cellulose acetate is colored red from an aqueous solution of the dye which may contain salt.

The disazo compound thus obtained has the formula /H NO1--N=N N=N N 0 (H! C H2S O zNH: C H: Example 7 0.1 mole of 2-nitro-4-aceto-2'-sodium sul- ,fomethyl-4'-amino-5'-methoxy azobenzene is diazotized and coupled with 0.1 mole of di-phydroxyethyl aniline following the procedure described in Example 5. Cellulose acetate is colored a red shade from an aqueous solution of the dye which may contain salt.

The disazo compound thus obtained has the formula:

CHgCO tized with sodium nitrite in a cold dilute hydrochloric acid suspension and one mole of mamino benzyl alcohol dissolved in cold dilute hydrochloric acid is added. After standing for a short time, the mixture is made neutral to Congo red indicator with sodium acetate. When the coupling reaction is complete, the dye is filtered off, washed and dried. Cellulose acetate is colored an orange shade from aqueous suspensions of the dye.

The polyazo compound thus obtained has the formula:

CHZOH Example 9 One mole of 4-nitro-4-amino azobenzene is diazotized and coupled with one mole of p-hydroxyethyl-m-amino benzyl alcohol acetate following the procedure described in Example 8.

Cellulose acetate is colored a brownish-red shade from aqueous suspension of the dye. The polyazo compound thus obtained has the formula:

Example 10 One mole of the following disazo compound is diazotized with sodium nitrite in a solution of cold dilute hydrochloric acid. One mole of 3-hydroxyethyl phenylphosphatoethyl aminobenzyl methyl ether is dissolved in water and the diazo mixture slowly added. Concurrently with the addition of the diazo salt there is added an aqueous solution of sodium carbonate at such a rate that the mixture is just acid to litmus indicator. When the coupling is complete, the dye is salted out if necessary, filtered and dried. Cellulose acetate is colored a. red shade from an aqueous solution of the dye which may contain salt.

The polyazo compound thus obtained has the formula:

HgOH

11,03 K WCHIOCH! ll The invention is further illustrated by reference to the following Table A. The compound listed under the heading Amine is diazotized and coupled with an equivalent quantity of the 1N0,- N=N N=N N specified compound in the column entitled Coupling component, the dye resulting therefrom g, coloring cellulose acetate the shades designated.

' Table A Amine I, I Coupling component I ggagf (1) O Q H, Barbituric c d Orange-yellow- HgOH c1 (2) QN= -Q E o ..L D-

1 onion ..do Do.

do D0.

do D0.

----.do Do.

Shade on cellulose Amine Coupling component acetate C211! (7) NOzQN: QNH, Barbiturlc acid Orange-yellow.

N0: H:O CaHlOH CHz-CH=CH: 8) NO:C 'N=N-: NH: .-.-.do Do- (9) NOIQN=NQNHS -.-do Do.

NO; CH: (10) N IQN= QM! mac Do.

No: HaOH Br 00H! (11) N0' N=N m1, .....do Do.

No: HaOH CQHI (12) N0 N=NQNHQ do Do.

(1a) N QN=NQNH1 do Do.

8020B: CHzOH N: NE, do D0.

HgO C O OH:

N=N NH: do D0.

HaOH

S 16 cmo /C-N=N NH,

Amines 1-16. p-Cresol o Do. Do m-To1uidine D0. D0 m-Aminobenzyl alcohol. D0. Do Dimethyl-aniline Oraaxge to orangere Do--. Diphenylamine Do. Do Ethyl B-hydroxyethyl toluidine D0. Do Ethyl-B-hydroxyethyl cresidine Olgnge to n1- me. Ethyl-B-hydroxyethy1-2,5-dlmethox- D'o.

yaniline. V J Ethyl g1ycerylani1ine Orange to red. I

Ethyl glyceryl-nl-toluidlno Ethyl glyceryl cres idino. a

Ethyl glyceryl-m-chlnroa'nilmo Ethyl glyceryl-d-naphthylamme- Ethyl glyceryl-amino-5-naphthol D -B-hydroxyethyl aniline; Dl-fi-hydroxyethyl-m-toluidine Di-fl-hydroxyethyl cresidine B-hydroxyethyl-m-toluidino Ethyl sulfatoethyl aniline I Butyl sulfoethyl aniline Acetoacetnilide 3-ethy1ammo-4-methoxy benzyl ace- Orange to Inbine.

' Orange-red.

Red to tubine brownish tint.

Do. Rubine brownish tint. Orange to red brownish tint.

Do. Orange-yellow. Red to rubine brownish tint.

Shade on cellulose Amme Coupling component meme 7 (17) O- QNIL Barbituric acid Orange-yellow.

HgSOaN H28 0 :Na

0 CH; (19) NOGN=N-QNH2 -----do Do- HzS O aNa (20) NOQN= NH: ...d0 Do.

1 His OzNH4 Q (21) NO MQNH, Do.

N 0 2 Has 03NH4 Br C|yclohexy1 NO: HiSOIH N0: CH:CH=CH:

' N 0, H 8 0N8 cetyl N=N NH, do Do.

Has 0 311 I O O HzS OaNa (2e) NOQ N=N NH: n no.

OQCH: HISOma H; (27) Q -QN= NH| .....do Do.

H: HzS O4NH4 HsS OaNB CH -CH: (2s) cmo s J 0 /CN=N NH: .....do D0. N/ E28 0 :NB

nes 7-2 Methone D0.

D 1-phenyl-3-methyl-5-pymzol0ne. D0- p-Oresol 0- Diphenylamine Orange to rubjno. Cresidine Do. Do. Do. Cetyl-fl-hydroxyethyl-m Do. Cyclohexyl-m-chlorauiline Orange to red. OIeIyI-g-SIuHoethyI-m-amino benzyl- Red to rubineu a co 0 Di-B-hydroxyethylaniline Do. Di'fi-hydroxyethyl-m-toluidine Do. 1 6-11ydroxyethyl-amino-E-naphthol Red-blue fl-methoxyethyl-tetrahydrofurfuryl- Bed to wme.

2.5-dimethoxy-aniline.

Shade on cellulose Amine Coupling component acetate Amines 17-28 N Red to rublne.

C H4OQO cetyl Ha C2H4OCOCH:

Do N Red to wine.

C3H OCOCH H (8 or a) ON Q-NH: m-Ethylernino-benzyl alcohol Red.

(30) N 0 N: NH; m-Butyl sodium sulio-ethylamino- Do.

benzyl methyl ether.

(31) NOON=N N H, m-Hydroxyethyl ammonium sul- Violet. iatoethylamino-benzyl alcohol.

no 01 Y (32) N= @NH: milElthyl glyoerylamino-benzyl alco- Do.

I Ha

( NO N NH; m-Cetyl hydroxyethylamino-benzyl Rubine.

alcohol.

SOaH Hz The polyazo compounds of our invention may also be prepared by an alternative procedure which differs substantially from thepreceding. This process illustrated diagrammatically below comprises the steps of diazotizing a nitro aminobenzyl alcohol (I) and coupling it with a coupling component R1 to form the azo compound (II) which is reduced to .the amine compound (III) followed by re-diazotization and re-coupling with the coupling component R to form the disazo wherein R, R1, and Y have the same meanings as previously designated, and Z represents hydrogen, an alkyl group, and an acyl group. The following example illustrates the process more specifically.

Example 11 16.8 grams of 2-amino-5-nitro benzyl alcohol are placed in 200 c. c. of water with 40 c. c. of hydrochloric acid and diazotized at 5-15 C. with 6.9 grams of sodium nitrite. The diazo mixture is then stirred into an iced solution of 18.1 grams of di-p-hydroxyethyl aniline in dilute hydrochloric acid. When the coupling reaction is complete, the mixture is neutralized with sodium acetate, the dye filtered out, washed and dried. Cellulose acetate is colored orange shades from aqueous suspensions of the dye.

The azo compound thus obtained has the formula:

cinlon The reduction step of the process comprises suspending approximately 30 grams of the above azo compound in 500 c. c. of water heated to 60-65 C. and then adding a solution of 50 grams of .fused sodium sulfide in 100 c. c. of water stirring being continued for at least an hour. After the mixture has cooled to room temperature, the dye is filtered 011 and washed with water. The reduced product has the formula:

The re-diazotization and re-coupling step of the process comprises diazotizing approximately 28 grams of the above azo compound and coupling it with an equivalent quantity of a coupler of the benzene series following in general the procedures CzHlOH already described for diazotization and coupling. The disazo compounds thus obtained have the general formula:

Another alternative procedure for the preparation of the polyazo compounds 01' our invention consists of the steps of reducing the azo compounds (I), which may be prepared by the meth- 0d of our copending application Serial No. 147,541,

R N=N to the corresponding amines (II), diazotizing the latter compounds and then coupling them with CH CQHIOH coupling components represented by R2 to form the polyazo compounds (III);

Y and constitute valuable dyestuffs for the colora- Reduction tion of organic derivatives of cellulose. Obviously N0r'-R=N=N- N the hydroxyl groups may be etherlfied or esterifled if desired during some step of the process or C3202 after the formation of the disazo compound. (I)

The following Table B discloses a number of R. diazotization and coupling components which diazotize may be combined in the manner designated to =N m form the nitro azo compounds of the first step of R, the above described process. It is to be under- CHQOZ stood that the azo compounds thus formed may (n) Y be subjected to the other steps of the process R4 including reduction to the corresponding amine and re-diazotization and re-coupllng with a benzene coupler to form the disazo compounds of ('maoz our invention. n

Table B Shade on cellulose Amine Coupling component acetate N0 NH: (1) Ethyl-B-hydroxyethylaniline Orange.

mocoom (2) Barbiturlc acid Green-yellow.

(3) 5.5-Mez-cyclohexandione-1,3 Do. 0 Do.

Orange-yellow. Red. Brown-red. Do. (9) B-hydroxyethyl cresidine Do.

NOQNH: (l0) l-Bdrydroxyethyl-amino-naphthol--- Blue.

HiQE Do (ll) Ethyl-fl-hydroxyethyl-m-toluidine Red. Do (12) B-hydroxyethyl-m-toluidine Brownto rubine.

Br I NOIQ'NH Couplers 2-12 Same shades.

CHflOCZHlOCHI N n-QNH: Couplers 2-5 D0.

omocm Do (13) Di-fl-hydroxyethyl-Z-ethoxy-Mhloroanillne. Orange. Do (14) Ethyl methyl-m-chloroauiline Orange-yellow.

01 NOQNH, CouplersG-S Same shades.

HQOCOCH! (15) Glycerylcresldine Violet.

(l6) Di-fl-hydroxyethyl-m-toluidlne Do. (17) Di-fl-hydroxyethyl-a-naphthylamine Blue. (18) LB-hydroxyethylemino-5-naphth0l Blue-green.

Example 12 27.6 grams of p-nitrobenzene-azo-diinethylamino-m-benzyl alcohol are suspended in 500 c. c. of water heated to 60-65 C. A solution of 50 grams of fused sodium sulfide in 100 c. c.-of

water is added and stirring continued for at least an hour. After the mixture has cooled to room temperature the dye is filtered off and washed with water.' Cellulose acetate is colored yellow shades from aqueous suspensions of the dye. The amino azo compound thus obtained has formula:

This compound may then be diazotized and coupled with various suitable coupling compo- I nents to form the polyazo compounds desired fol lowing in general the processes of Examples 1-4. L; The following table still further illustrates the, kind of azo compounds which may be obtained by the reduction step of the above described process, it being understood in each case that these amino azo compounds can be diazotized and coupled in the usual manner with suitable cou- J pling components of the R2 type.

Table 0 C H2- 0 H: C H: N=N N (1) HzN one-onion,

CHzO CHI OCH: /C:H4OH

C:H|OH l CHaOH OCH: CH: CH:

(4) HgN N=N N\ 0211a CH: CHIOH OCH:

(6) EN N=N N\ J: CHrlCHOELCHzOH HQOE (6) HINGN=N-QN CIHIO CH:

| CH: Q Q (7) HIN N=N -N CH: O: HaOH the I Textile materials made of or containing organic derivatives of cellulose and particularly cellulose acetate in the form of threads, yarns, filaments, and fabrics may be colored by the polyazo compounds of our invention either by direct processes of dyeing with the completed dyestuffs or by impregnation of the materials with the aminoazo or Iaminopolyazo intermediates, diazotizing thereon, and then developing the final colors on the fibers with the selected coupling components. It is to be'understood, of course, that the aminoazo and 'aminopolyazo intermediates are in themselves Example 13 100 grams of a cellulose acetate fabric is dyed a deep yellow color at -85 C. in 2 liters of water containing 1 gram of finely dispersed dye having the formula:

onion The fabric is washed and then immersed for 20-30 minutes in a bath containing 3 grams per liter of sodium nitrite and 6 0.0. of hydrochloric acid whereby the amine contained in the fiber is converted to the diazo salt. The cloth is rinsed and developed to a black shade by treatment with an aqueous dispersion of p-hydroxynaphthoic acid maintained at a pH value of about 4 to 6. If in place of p-hydroxynaphthoic acid, there is used 1-amino-5-naphthol a blue shade is obtained. The developers are not restricted specifically to just fi-hydroxy naphthoic acid and to 1-amino-5- naphthol, since satisfactory colors may also be obtained on cellulose acetate silk with their substitution products and derivatives including the acid methyl ester, the acid amide, andthe alkyl and aryl substituted acid amides of p-hydroxy naphthoic acid, and the 1-amino-5-naphthols wherein at least one of the hydrogens of each amino group is substituted by an alkyl or acyl group.

In the direct dyeing with the finished polyazo dyestuff, it will be found that many of these dyes in aqueous solutions without the necessity of employing a dispersing or solubilizing agent. In this case the dyeing will be conducted in accordance with the usual dyeing practice, salt being added if desired to facilitate the exhaustion of the dye bath. For a more detailed description as to how the water-soluble polyazo dyes of our invention may be employed for the coloration of cellulosic materials, reference may be had to our U. S. Patent No. 2,107,898 issued February 8, 1938. I Where the particular polyazo compound is water-soluble, the dye will ordinarily be applied to the material in the form of an aqueous suspension which can be prepared by grinding the dye to a paste in the presence of a sulfonated oil, soap or other suitable dispersing agent and dispersing the resulting paste in water. Dyeing operations can advantageously be conducted at a temperature of 80-85 C., but any suitable temperature may be used. Upon completion of the dyeing operation, the cellulosic material is removed, washed with soap, rinsed and dried.

Typical organic derivatives of cellulose include the hydrolyzed as well as the unhydrolyzed cellulose organic acid esters and cellulose mixed organic acid esters such as cellulose acetate, cellulose formate, cellulose propionate, cellulose butyr- .ate, cellulose acetate-propionate, cellulose acetate-butyrate, and cellulose ethers such as methyl cellulose, ethyl cellulose, and benzyl cellulose.

The expression alkyl as used throughout the specification and claims, unless otherwise specified, is intended to mean the unsubstituted alkyl groups such as methyl, ethyl, propyl, butyl and the like, as well as their substitution products such as monoand polyhydroxyalkyl groups, and the etherified, esterified, sulfonated, and sulfated monoand polyhydroxyalkyl groups, the more common examples of such substituted groups including hydroxyethyl, dihydroxypropyl, methoxyethyl, ethoxyethyl, acetoxyethyl, sulfoethyl, and sulfatoethyl among others.

The expression sulfo" group as used throughout the specification and claims, unless otherwise specified is intended to mean the free acid group o son 31K and wherein R represents a member selected from the group consisting of a benzene nucleus, a-H

naphthalene nucleus, and a benzothiazole nucleus; R1 represents a member selected from the group consisting of a benzene nucleus, 9. naphthalene nucleus, a barbituric acid nucleus, and a pyrazolone nucleus, R2 represents a member selected from the group consistingof a benzene nucleus, 9. naphthalene nucleus, an azobenzene nucleus, and a benzothiazole nucleus, R3 represents a member selected from the group consisting of a benzene nucleus, and a naphthalene nuc1eus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, R4 and R5 each represent a member selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group of the benzene series, and a furyl group, and X represents a member selected from the group consisting of a hydroxyl group, an alkoxy group, an acyloxy group, and a sulfo group.

2. The polyazo dye compounds having the general formula:

V crux a phenoxy group, and X represents a hydroxyl group, an alkoxy group, an acyloxy group, and a sulfo group.

3. The polyazo dye compounds having the general formula:

. HzX wherein R represents a member selected from the group consisting of a benzene nucleus, 9. naphthalene nucleus, and a benzothiazole nucleus, R1 represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, a barbituric acid nucleus, and a pyrazolone nucleus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, and X-represents a hydroxyl group, an alkoxy group, an acyloxy group, and a sulfo group.

4. The polyazo dye compounds having the general formula:

wherein R2 represents a member selected from the group consisting of a benzene nucleus, a

naphthalene nucleus, an azobenzene nucleus, and a benzothiazole nucleus, R3 represents a member selected from the group consisting of a benzene nucleus, and a naphthalene nucleus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a

phenyl group, and a phenoxy group, R4 and R each represent a member selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group of the benzene series, and a furyl group, and X represents a member selected from the group consisting of a hydroxyl group, an alkoxy group, an acyloxy group, and a sulfo group.

5. The polyazo dye compounds selected from the group consisting of polyazo compounds having the general formulae:

wherein R represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, and a benzothiazole nucleus, R1 represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, a barbituric acid nucleus, and a pyrazolone nucleus, R2 represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, an azobenzene nucleus, and a benzothiazole nucleus, R3 represents a member selected from the group consisting of a benzene nucleus, and a naphthalene nucleus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, R4 and R5 each represent a member selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group of the benzene series, and a furyl group.

6. The polyazo dye compounds selected from the group consisting of polyazo compounds having the general formulae:

represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, and R4 and R6 each represent a member selected trom the group consisting of hydrogen, an alkyl group,

I a cycloalkyl group, an aryl group of the benzene series, and a furyl group.

7. Material made of or containing an organic derivative of cellulose colored with a polyazo dye compound selected from the group consisting of polyazo compounds having the general formulae:

wherein R represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, and a benzothiazole nucleus, R1 represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, a barbituric acid nucleus, and a pyrazolone nucleus, R2 represents a member selected from the group consistingof a benzene nucleus, a naphthalene nucleus, an azobenzene nucleus, and a benzothiazole nucleus, R3 represents a member selected from the group consisting of a benzene nucleus, and a naphthalene nucleus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, R4 and R5 each represent a member selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group of the benzene series, and a furyl group, and X represents a member selected from the group consisting of a hydroxyl group, an alkoxy group, an acyloxy group, and a sulfo group. i

8. Material made of or containing cellulose acetate colored with a polyazo dye compound se- -ected from the group of polyazo compounds having the general formulae:

R-N=N N=NR1 Ba and Rr-N=NR:N=N N Rs HzX wherein R. represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, and a benzothiazole nucleus, R1 represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, a barbituric acid nucleus, and a pyrazolone nucleus, R2 represents a member selected from the group consisting of a benzene nucleus, a naphthalene nucleus, an azobenzene nucleus, and a benzothiazole nucleus, R3 represents a member selected from the group consisting of a benzene nucleus, and a naphthalene nucleus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, R4 and R5 each represent a member selected from the group consisting of hydrogen, an alkyl group,

wherein R1 represents a member selected from a cycloalkyl group, an aryl group of the benzene series, and a furyl group, and X represents a member selected from the group consisting of a hydroxyl group, an alkoxy group, an acyloxy group, and a sulfo group.

9. The process of producing dischargeable dyeings on cellulose acetate silk which comprises dyeing it with a dye selected from the group consisting of azo compounds having the general formulae:

C HQX and Rs CHzX the group consisting of a benzene nucleus, a naphthalene nucleus, a barbituric acid nucleus, and a pyrazolone nucleus, R3 represents a member selected from the group consisting of a benzene nucleus, and a naphthalene nucleus, Y represents a member selected from the group consisting of hydrogen, a halogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylene group, a phenyl group, and a phenoxy group, R4 and Rs each represent a member selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group of the benzene series, and a furyl group, and X represents a- CERTIFICATE OF CORRECTION. PatentNo. 2,216,L L 6. October 1, 191m.

JAMES G, McNALLY, ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 9, first column, line 11, for "water-soluble" read --w ater-insoluble-; and that the said Letters Patent should be read with this correction therein that the same ma; conform to the record of the case in the Patent Office.

Signed and sealed this hth day of February, A. D. l9hl.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

